“What advice would you have for someone who wants to write professionally?” is a pretty tall order. It’s a question that, while I love answering it, remains one of the toughest to answer because you are being asked for that “One Ring” kind of answer. What’s the one takeaway you want people to have after meeting you? Well, apart from buying my latest book, there’s no one thing that makes an aspiring author a success. A lot goes into building a professional writing career.

But one thing I’ve...